boxplot with grouped variables

It will not work because the presence of the first row means that all
the variables are read in as factors, not numeric. You must convert
numeric variables to numeric **after** eliminating the first row, or
read the data in using read.table(..., head=TRUE). See ?read.table for
details.

**After** the above changes, perhaps

with(Daten, boxplot(Gewicht ~ interaction(Dosis,Geshlecht, drop=TRUE)) )

will work if you read in column names properly. Otherwise, V2
~interaction(V1,V3, drop=TRUE) if you do the conversions to numeric.

Please read *An Introduction to R" or other online R tutorial before
posting further here. You need to understand basic R data handling
before you proceed. At present, you do not.

-- Bert

my dataset looked like this in the beginning:

Daten

      V1      V2         V3
1  Dosis Gewicht Geschlecht
2      0    6.62          m
3      0    6.65          m
4      0    5.78          m
5      0    5.63          m

I need box plots for V2 with all combination of V1 and V3, so I deleted the
first row, and tried this:
boxplot(Daten$V2[Daten$V3=="m"])
but it does not work and I have no clue what I did wrong.
I'm thankful for any help!

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Bert Gunter
Genentech Nonclinical Biostatistics

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